Chek-Mate Medium Flow (0.5-5 LPM) by SKC

Personal Monitoring
Air Sampling Flow Calibrator Manufacturer: SKC
Chek-Mate Medium Flow (0.5-5 LPM) by SKC
Chek-Mate Medium Flow (0.5-5 LPM) by SKC
Chek-Mate Medium Flow (0.5-5 LPM) by SKC

The Chek-Mate Medium Flow by SKC is a portable electronic flowmeter designed for verifying and calibrating personal air sampling pumps in the medium flow range of 0.5–5 LPM, with a volumetric accuracy of ±1% of reading compliant with ISO 13137:2022 and ASTM D5337. It communicates directly with CalChek-ready pumps such as the AirChek TOUCH and GilAir Plus, enabling automatic single-point verification or full multi-point calibration to reduce operator error and save time. It is the go-to calibration tool for industrial hygienists conducting OSHA-compliant air sampling for chemical vapors, dust, and other occupational exposure assessments.

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What flow range and accuracy does the Chek-Mate Medium Flow offer?
0.5 to 5 L/min, reading to 0.001 L/min. Accuracy is plus or minus 1 percent of reading from 0.75 to 5 L/min, widening to plus or minus 2.5 percent at the extreme ends of the range. If your target flow sits right at 0.5 L/min, expect the wider tolerance.
How long does it run on a battery?
About 30 hours typical on a 9-volt alkaline, and it also accepts a rechargeable NiMH cell. The display carries a low battery indicator so you are not caught out partway through a round of pump checks.
Does it switch itself off?
Yes. It shuts off automatically after 15 minutes without airflow. Worth knowing if you set it up and then get pulled away, because you may return to find it powered down rather than mid-reading.
Does it average readings for me?
Yes, the LCD includes an averaging function. That is useful on pumps with slight pulsation, where a single instantaneous reading can sit above or below the true mean flow.
What are the environmental limits?
32 to 104 degrees Fahrenheit (0 to 40 Celsius), and up to 10,000 feet altitude. Outside that band readings should not be relied on for a calibration record.
How does it compare with the Bios Defender 520M?
Both cover roughly the same flows, but they differ in documentation. The Chek-Mate publishes a stated accuracy figure and runs on a 9-volt battery with an averaging display. The Defender 520M offers percent-of-reading accuracy backed by NVLAP NIST ISO 17025 accreditation, plus interval logging and a PC interface for automatic record keeping. Choose the Defender if you need the calibration trail captured digitally.
Which Chek-Mate do I need for sorbent tube sampling?
The Low Flow model, not this one. Sorbent tube methods typically run between 20 and 200 mL/min, below this unit's 0.5 L/min floor. The Chek-Mate Low Flow covers 20 to 500 mL/min.

Features & Capabilities

Calibration Certificate Available: ✓ Yes
Monitoring Scope: Personal Monitoring

Equipment Specifications

Measurement Type: Volumetric flow calibration
Measurement Range: 0.5 to 5 L/min (medium flow)
Resolution: 0.001 L/min
Accuracy: ±1% of reading from 0.75 to 5 L/min; ±2.5% at the extreme ends of the range
Additional Features: Automatic shutoff after 15 minutes without airflow
Display: LCD with low battery indicator and averaging function
Operating Temperature Range: 32°F to 104°F (0°C to 40°C)
Altitude Limit: Up to 10,000 ft
Power Supply: 9-volt alkaline battery (30 hours typical) or rechargeable NiMH
Intended Use: Medium-flow calibration of personal air sampling pumps

Kit Contents

SKC ChekMate Flow Calibrator, Tubing for Calibration (1) 1/4” ID & (1) 1/8” ID, Luer Adapter (To Connect to Cassette), Phillips-Head Screwdriver for Battery Removal, Spare 9V Battery, USB Flash Drive with Manuals / Quick Start Guide / Specs, Calibration Certificate (emailed)

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